diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendReceivedRequestViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendReceivedRequestViewModel.java
index 275eb6b..2542cc1 100644
--- a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendReceivedRequestViewModel.java
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendReceivedRequestViewModel.java
@@ -13,6 +13,7 @@
 import retrofit2.Response;
 import retrofit2.Retrofit;
 import retrofit2.converter.jackson.JacksonConverterFactory;
+import retrofit2.converter.scalars.ScalarsConverterFactory;
 
 public class FriendReceivedRequestViewModel extends ViewModel {
     //サーバー(API)と通信するためのツール
@@ -28,6 +29,7 @@
 
         this.retrofit = new Retrofit.Builder()
                 .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/tampopo/")
+                .addConverterFactory(ScalarsConverterFactory.create())
                 .addConverterFactory(JacksonConverterFactory.create())
                 .build();
         this.friendRequestsResource = retrofit.create(FriendRequestsResource.class);
diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
index b7a0baa..9042e86 100644
--- a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
@@ -13,6 +13,7 @@
 import retrofit2.Response;
 import retrofit2.Retrofit;
 import retrofit2.converter.jackson.JacksonConverterFactory;
+import retrofit2.converter.scalars.ScalarsConverterFactory;
 
 public class FriendSentRequestViewModel extends ViewModel {
     // サーバー(API)と通信するためのツール
@@ -31,6 +32,7 @@
     public FriendSentRequestViewModel() {
         this.retrofit = new Retrofit.Builder()
                 .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/tampopo/")
+                .addConverterFactory(ScalarsConverterFactory.create())
                 .addConverterFactory(JacksonConverterFactory.create())
                 .build();
 
@@ -75,7 +77,7 @@
 
     // サーバーにフレンド申請を送信するメソッド
     public void sendFriendRequest(String senderId, String receiverId, String token) {
-        Call<FriendRequest> call = friendRequestsResource.postFriendRequest(token, senderId, receiverId);
+        Call<FriendRequest> call = friendRequestsResource.postFriendRequest(senderId, receiverId, token);
 
         call.enqueue(new Callback<FriendRequest>() {
             @Override